Quick Answer: How Do You Initialize A Variable In SAS?

What is a variable in SAS?

A SAS dataset consists of columns of variables and rows of observations.

Variables correspond to characteristics of the data that are documented for all (or most) of the observations..

What is best12 format in SAS?

refers to the instructions that SAS uses when printing variable values. If no format is specified, the default format is BEST12. … refers to the instructions that SAS uses when reading data values. If no informat is specified, the default informat is w.d for a numeric variable, and $w. for a character variable.

What does noobs mean in SAS?

“NOOBS – Suppress the column in the output that identifies each observation by number” “LABEL – Use variables’ labels as column headings”

What does it mean when a variable is uninitialized in SAS?

The “NOTE: Variable X is uninitialized” message is a result of trying to run a DATA Step which utilizes a variable that is not present in the input dataset or has not been created at the point within the DATA Step where SAS tries to utilize the variable.

How do I substring in SAS?

INTRODUCTION: PROPER SYNTAX USE The syntax for the SUBSTR function on the left-hand side of the equal sign is: SUBSTR( string, starting position <, length> ) = ‘characters-to-replace’, while the right-hand side syntax is: SUBSTR( string, starting position <, length>).

What is data _null_ in SAS?

In SAS, the reserved keyword _NULL_ specifies a SAS data set that has no observations and no variables. … The _NULL_ data set is often used when you want to execute DATA step code that displays a result, defines a macro variable, writes a text file, or makes calls to the EXECUTE subroutine.

What is a macro variable in SAS?

Macro variables are tools that enable you to dynamically modify the text in a SAS program through symbolic substitution. … The value of a macro variable remains constant until it is specifically changed. Macro variables are independent of SAS data set variables.

What is variables in statistics?

A variable is a characteristic of a unit being observed that may assume more than one of a set of values to which a numerical measure or a category from a classification can be assigned (e.g. income, age, weight, etc., and “occupation”, “industry”, “disease”, etc.

What is the value of an uninitialized variable in C++?

An uninitialized variable has an undefined value, often corresponding to the data that was already in the particular memory location that the variable is using. This can lead to errors that are very hard to detect since the variable’s value is effectively random, different values cause different errors or none at all.

What is _N_ in SAS?

What is the automatic variable _n_? When you open a SAS data file in a data library, you will notice the observations are numbered at the first column. The automatic variable _n_ represents the observation numbers. This variable hidden in the DATA step is simple yet powerful in programming practice.

How do you make a variable numeric in SAS?

Convert character to numeric. To convert character values to numeric values, use the INPUT function. new_variable = input(original_variable, informat.); The informat tells SAS how to interpret the data in the original character variable.

What is put function in SAS?

The PUT statement and the PUT function are similar. The PUT function returns a value using a specified format. … The PUT statement writes a value to an external destination (either the SAS log or a destination you specify).

How do I convert a number to a date in SAS?

To change a numeric variable to a SAS date value, use both the PUT and INPUT functions. The PUT function converts the value from numeric to character. The INPUT function will then convert the character variable to the numeric SAS date.

How does retain work in SAS?

The RETAIN statement simply copies retaining values by telling the SAS not to reset the variables to missing at the beginning of each iteration of the DATA step. If you would not use retain statement then SAS would return missing at the beginning of each iteration. The retain statement keeps the value once assigned.

How do you declare a variable in SAS?

You can create variables in a DATA step in the following ways:by using an assignment statement.by reading data with the INPUT statement in a DATA step.by specifying a new variable in a FORMAT or INFORMAT statement.by specifying a new variable in a LENGTH statement.by specifying a new variable in an ATTRIB statement.

What is PROC content SAS?

Summarizing Data with PROC CONTENTS. The CONTENTS procedure generates summary information about the contents of a dataset, including: The variables’ names, types, and attributes (including formats, informats, and labels) How many observations are in the dataset.

What is Substr in SAS?

INTRODUCTION. The SAS data step function SUBSTR (commonly pronounced “sub- string”) function is used to work with a specific position or positions of characters within a defined character variable. The function focuses on a portion of a string and can go on either side of the “=” sign in a data step statement.

How do I rename a column in SAS?

To do so, you’ll want to use the RENAME= option. As its name suggests, the RENAME= option allows you to change the variable names within a SAS data set.

How do you change a variable in SAS?

SAS uses the BESTw. format, where w is the width of the character variable and has a maximum value of 32. You cannot change the type of a variable. You will need to create a new variable from the old variable with the new data type and then drop and rename to keep the original names.